Just finished Dark Forces - starting Return to Castle Wolfenstein: am contemplating what other games my Macbook with a lowly x3100 can manage. It will be a while before I can afford a new machine that'll play anything from >this< century : D
As a side note, I'm mightly glad that the game play of these old titles more than makes up for the ageing of the graphics, though RTCW plays really well, and still looks pretty decent all things considered.